Optical image lens system

ABSTRACT

An optical image lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has positive refractive power. The second lens element has positive refractive power. The third lens element has positive refractive power. The fourth lens element has refractive power. The fifth lens element with refractive power has an image-side surface being convex in a paraxial region thereof, wherein at least one surface of the fifth lens element is aspheric. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region thereof, wherein at least one surface of the sixth lens element is aspheric, and the image-side surface of the sixth lens element has at least one inflection point thereon.

RELATED APPLICATIONS

The present application is a continuation of the application Ser. No.13/652,485, filed Oct. 16, 2012, the entire contents of which are herebyincorporated herein by reference, which claims priority to TaiwanApplication Serial Number 101114204, filed Apr. 20, 2012, all of whichare herein incorporated by reference.

BACKGROUND

1. Technical Field

The present invention relates to an optical image lens system. Moreparticularly, the present invention relates to a compact optical imagelens system applicable to electronic products and three-dimensional (3D)image applications thereof.

2. Description of Related Art

In recent years, with the popularity of mobile products with camerafunctionalities, the demand of miniaturized optical lens systems isincreasing. The sensor of a conventional photographing camera istypically a CCD (Charge-Coupled Device) or a CMOS (ComplementaryMetal-Oxide-Semiconductor) sensor. As the advanced semiconductormanufacturing technologies have allowed the pixel size of sensors to bereduced and compact optical lens systems have gradually evolved towardthe field of higher megapixels, there is an increasing demand forcompact optical lens systems featuring better image quality.

A conventional compact optical lens system employed in a portableelectronic product mainly adopts a structure of four-element lens suchas the one disclosed in U.S. Pat. No. 7,869,142. Due to the popularityof mobile products with high-end specifications, such as smart phonesand PDAs (Personal Digital Assistants), the requirements for highresolution and image quality of modern compact optical lens systems hasbeen increasing significantly. However, the conventional four-elementlens structure cannot satisfy these requirements of the compact opticallens system.

Although other conventional optical lens system with five-element lensstructure such as the ones disclosed in U.S. Pat. No. 8,000,030 and U.S.Pat. No. 8,000,031 enhance image quality and resolving power, theseoptical designs still reside with unsolved problems. Since there are nothree continuous lens elements closest to the object side with positiverefractive power, it is not favorable for presenting its telephotofunctionality in which the telephoto ratio is thereby limited. Theseoptical designs are also hard to keep the lens system compact whileachieving for the same telephoto ratio. Besides, these optical designsare not favorable for reducing the sensitivity of the lens systembecause its positive refractive power of these optical systems is noteffectively distributed.

SUMMARY

According to one aspect of the present disclosure, an optical image lenssystem includes, in order from an object side to an image side, a firstlens element, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element. The first lenselement has positive refractive power. The second lens element haspositive refractive power. The third lens element has positiverefractive power. The fourth lens element has refractive power. Thefifth lens element with refractive power has an image-side surface beingconvex in a paraxial region thereof, wherein at least one of anobject-side surface and the image-side surface of the fifth lens elementis aspheric. The sixth lens element with refractive power has animage-side surface being concave in a paraxial region thereof, whereinat least one of an object-side surface and the image-side surface of thesixth lens element is aspheric, and the image-side surface of the sixthlens element has at least one inflection point thereon. The opticalimage lens system has a total of six lens elements with refractivepower, and of the first lens element, the second lens element, the thirdlens element, the fourth lens element, the fifth lens element and thesixth lens element of the optical image lens system, there is a space ina paraxial region between every pair of lens elements that are adjacentto each other.

According to another aspect of the present disclosure, an optical imagelens system includes, in order from an object side to an image side, afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element and a sixth lens element. Thefirst lens element has positive refractive power. The second lenselement has positive refractive power. The third lens element haspositive refractive power. The fourth lens element has refractive power.The fifth lens element with refractive power has at least one of anobject-side surface and an image-side surface being aspheric. The sixthlens element with refractive power has an image-side surface beingconcave in a paraxial region thereof, wherein at least one of anobject-side surface and the image-side surface of the sixth lens elementis aspheric, and the image-side surface of the sixth lens element has atleast one inflection point thereon. The optical image lens system has atotal of six lens elements with refractive power. The optical image lenssystem further includes a stop located between an object and the firstlens element, and of the first lens element, the second lens element,the third lens element, the fourth lens element, the fifth lens elementand the sixth lens element of the optical image lens system, there is aspace in a paraxial region between every pair of lens elements that areadjacent to each other.

According to further another aspect of the present disclosure, anoptical image lens system includes, in order from an object side to animage side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element and a sixth lenselement. The first lens element has positive refractive power. Thesecond lens element has positive refractive power. The third lenselement has positive refractive power. The fourth lens element hasrefractive power. The fifth lens element with refractive power has atleast one of an object-side surface and an image-side surface beingaspheric. The sixth lens element with refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof, whereinat least one of the object-side surface and the image-side surface ofthe sixth lens element is aspheric, and the image-side surface of thesixth lens element has at least one inflection point thereon. Theoptical image lens system has a total of six lens elements withrefractive power, and of the first lens element, the second lenselement, the third lens element, the fourth lens element, the fifth lenselement and the sixth lens element of the optical image lens system,there is a space in a paraxial region between every pair of lenselements that are adjacent to each other.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood by reading the followingdetailed description of the embodiment, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an optical image lens system according tothe 1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical image lens system according to the 1stembodiment;

FIG. 3 is a schematic view of an optical image lens system according tothe 2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical image lens system according to the 2ndembodiment;

FIG. 5 is a schematic view of an optical image lens system according tothe 3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical image lens system according to the 3rdembodiment;

FIG. 7 is a schematic view of an optical image lens system according tothe 4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical image lens system according to the 4thembodiment;

FIG. 9 is a schematic view of an optical image lens system according tothe 5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical image lens system according to the 5thembodiment;

FIG. 11 is a schematic view of an optical image lens system according tothe 6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical image lens system according to the 6thembodiment;

FIG. 13 is a schematic view of an optical image lens system according tothe 7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical image lens system according to the 7thembodiment;

FIG. 15 is a schematic view of an optical image lens system according tothe 8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical image lens system according to the 8thembodiment;

FIG. 17 is a schematic view of an optical image lens system according tothe 9th embodiment of the present disclosure; and

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical image lens system according to the 9thembodiment.

DETAILED DESCRIPTION

An optical image lens system includes, in order from an object side toan image side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element and a sixth lenselement.

The first lens element with positive refractive power has a convexobject-side surface, and can have a concave image-side surface, so thatthe total track length of the optical image lens system can be reducedby properly adjusting the positive refractive power of the first lenselement.

The second lens element with positive refractive power can have a convexobject-side surface and a concave image-side surface. Therefore, thesensitivity of the optical image lens system can be reduced by balancingthe distribution of the positive refractive power of the first lenselement, and the surface curvature of the second lens element canthereby correct the astigmatism of the optical image lens system.

The third lens element with positive refractive power can enhance thetelephoto functionality of the optical image lens system by combiningwith the positive refractive power of the first lens element and thesecond lens element. Therefore, the optical image lens system can obtaina good telephoto ratio when applying to the six-lens optical system withhigh resolving power. The six-lens optical image lens system can therebynot only keep its optical system compact but also obtain a better imagequality. Furthermore, the third lens element can have a conveximage-side surface for adjusting the positive refractive power of thethird lens element.

The fourth lens element with negative refractive power has a concaveobject-side surface and a convex image-side surface, so that theaberration generated from the first through third lens elements withpositive refractive power can be corrected, and the astigmatism of theoptical image lens system can also be corrected.

The fifth lens element with positive refractive power has a conveximage-side surface. Therefore, the high order aberration of the opticalimage lens system can be corrected by adjusting the refractive power ofthe fifth lens element for enhancing the resolving power and retaininghigh image quality.

The sixth lens element with negative refractive power has a concaveimage-side surface, so that the principal point of the optical imagelens system can be positioned away from the image plane, and the totaltrack length of the optical image lens system can be reduced so as tomaintain the compact size of the optical image lens system. Furthermore,the sixth lens element has at least one inflection point on theimage-side surface thereof, so that the angle at which the incidentlight projects onto an image sensor from the off-axis field can beeffectively reduced, and the aberration of the off-axis field can befurther corrected.

When a focal length of the optical image lens system is f, and a focallength of the second lens element is f2, the following relationship issatisfied:

0<f/f2<0.8.

Therefore, the distribution of the positive refractive power can beproperly balanced for reducing the sensitivity of the optical image lenssystem, and the manufacturing, the assembling or the environmental testof the optical image lens system can be more stable.

f and f2 can further satisfy the following relationship:

0<f/f2<0.55.

When the focal length of the optical image lens system is f, a focallength of the third lens element is f3, and a focal length of the fourthlens element is f4, the following relationship is satisfied:

1.4<f/f3+|f/f4|<2.6.

Therefore, the distribution of the refractive power of the optical imagelens system can be balanced by properly adjusting the refractive powerof the third lens element and the sensitivity of the optical image lenssystem can be reduced. Moreover, the aberration generated from the thirdlens element can be corrected by adjusting the refractive power of thefourth lens element.

When a curvature radius of the object-side surface of the fourth lenselement is R7, and a curvature radius of the image-side surface of thefourth lens element is R8, the following relationship is satisfied:

−0.90<(R7−R8)/(R7+R8)<0.

By adjusting the surface curvature of the fourth lens element, theaberration generated from the first through third lens elements and theastigmatism can be corrected.

R7 and R8 can further satisfy the following relationship:

−0.50<(R7−R8)/(R7+R8)<0.

When a central thickness of the second lens element is CT2, and acentral thickness of the third lens element is CT3, the followingrelationship is satisfied:

0<CT2/CT3<0.75.

Therefore, the thickness of the second lens element and the third lenselement is favorable for manufacturing and assembling the optical imagelens system and thereby the manufacturing yield rate can be increased.

When an Abbe number of the fourth lens element is V4, and an Abbe numberof the fifth lens element is V5, the following relationship issatisfied:

1.5<V5/V4<3.5.

Therefore, the chromatic aberration of the optical image lens system canbe corrected.

When a focal length of the first lens element is f1, and a focal lengthof the third lens element is f3, the following relationship issatisfied:

0<(f1−f3)/(f1+f3)<1.0.

Therefore, the third lens element provides the main positive refractivepower to enhance the telephoto functionality of the optical image lenssystem and thereby the total track length of the optical image lenssystem is reduced for keeping the optical system compact.

When an Abbe number of the first lens element is V1, and an Abbe numberof the second lens element is V2, the following relationship issatisfied:

0.7<V1/V2<1.3.

Therefore, the chromatic aberration of the optical image lens system canbe corrected.

When a focal length of the second lens element is f2, and a focal lengthof the third lens element is f3, the following relationship issatisfied:

0.12<(f2−f3)/(f2+f3)<1.0.

Therefore, the distribution of the positive refractive power of thesecond lens element and the third lens element is proper for reducingthe sensitivity of the optical image lens system, and the total tracklength of the optical image lens system can be effectively reduced byobtaining a good telephoto ratio.

According to the optical image lens system of the present disclosure,the lens elements thereof can be made of glass or plastic material. Whenthe lens elements are made of glass material, the distribution of therefractive power of the optical image lens system may be more flexibleto design. When the lens elements are made of plastic material, themanufacturing cost can be effectively reduced. Furthermore, surfaces ofeach lens element can be aspheric, so that it is easier to make thesurfaces into non-spherical shapes. As a result, more controllablevariables are obtained, and the aberration is reduced, as well as thenumber of required lens elements can be reduced while constructing anoptical system. Therefore, the total track length of the optical imagelens system can also be reduced.

According to the optical image lens system of the present disclosure,when the lens element has a convex surface, it indicates that theparaxial region of the surface is convex; and when the lens element hasa concave surface, it indicates that the paraxial region of the surfaceis concave.

According to the optical image lens system of the present disclosure,the optical image lens system can include at least one stop, such as anaperture stop, a glare stop, or a field stop, etc. Said glare stop orsaid field stop is allocated for reducing stray light while retaininghigh image quality. Furthermore, an aperture stop can be configured as afront stop or a middle stop. A front stop which can be disposed betweenan object and the first lens element provides a longer distance from anexit pupil of the system to an image plane and thereby the generatedtelecentric effect improves the image-sensing efficiency of an imagesensor. A middle stop which can be disposed between the first lenselement and the second lens element is favorable for enlarging the fieldof view of the system and thereby provides a wider field of view for thesame.

According to the above description of the present disclosure, thefollowing 1st-9th specific embodiments are provided for furtherexplanation.

1st Embodiment

FIG. 1 is a schematic view of an optical image lens system according tothe 1st embodiment of the present disclosure. FIG. 2 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theoptical image lens system according to the 1st embodiment. In FIG. 1,the optical image lens system includes, in order from an object side toan image side, an aperture stop 100, a first lens element 110, a secondlens element 120, a third lens element 130, a fourth lens element 140, afifth lens element 150, a sixth lens element 160, an IR-cut filter 180and an image plane 170.

The first lens element 110 with positive refractive power has a convexobject-side surface 111 and a concave image-side surface 112. The firstlens element 110 is made of plastic material and has the object-sidesurface 111 and the image-side surface 112 being aspheric.

The second lens element 120 with positive refractive power has a convexobject-side surface 121 and a concave image-side surface 122. The secondlens element 120 is made of plastic material and has the object-sidesurface 121 and the image-side surface 122 being aspheric.

The third lens element 130 with positive refractive power has a convexobject-side surface 131 and a convex image-side surface 132. The thirdlens element 130 is made of plastic material and has the object-sidesurface 131 and the image-side surface 132 being aspheric.

The fourth lens element 140 with negative refractive power has a concaveobject-side surface 141 and a convex image-side surface 142. The fourthlens element 140 is made of plastic material and has the object-sidesurface 141 and the image-side surface 142 being aspheric.

The fifth lens element 150 with positive refractive power has a convexobject-side surface 151 and a convex image-side surface 152. The fifthlens element 150 is made of plastic material and has the object-sidesurface 151 and the image-side surface 152 being aspheric.

The sixth lens element 160 with negative refractive power has a concaveobject-side surface 161 and a concave image-side surface 162. The sixthlens element 160 is made of plastic material and has the object-sidesurface 161 and the image-side surface 162 being aspheric. Furthermore,the sixth lens element 160 has inflection points on the image-sidesurface 162 thereof.

The IR-cut filter 180 is made of glass, and located between the sixthlens element 160 and the image plane 170, and will not affect the focallength of the optical image lens system.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}{({Ai}) \times \left( Y^{i} \right)}}}$

wherein,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from the optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the distance from the point on the curve of the aspheric surface tothe optical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient.

In the optical image lens system according to the 1st embodiment, when afocal length of the optical image lens system is f, an f-number of theoptical image lens system is Fno, and half of the maximal field of viewof the optical image lens system is HFOV, these parameters have thefollowing values:

f=3.33 mm;

Fno=2.35; and

HFOV=39.4 degrees.

In the optical image lens system according to the 1st embodiment, whenan Abbe number of the first lens element 110 is V1, an Abbe number ofthe second lens element 120 is V2, an Abbe number of the fourth lenselement 140 is V4, and an Abbe number of the fifth lens element 150 isV5, the following relationships are satisfied:

V1/V2=2.40; and

V5/V4=2.42.

In the optical image lens system according to the 1st embodiment, when acentral thickness of the second lens element 120 is CT2, and a centralthickness of the third lens element 130 is CT3, the followingrelationship is satisfied:

CT2/CT3=0.51.

In the optical image lens system according to the 1st embodiment, when acurvature radius of the object-side surface 141 of the fourth lenselement 140 is R7, and a curvature radius of the image-side surface 142of the fourth lens element 140 is R8, the following relationship issatisfied:

(R7−R8)/(R7+R8)=−0.37.

In the optical image lens system according to the 1st embodiment, whenthe focal length of the optical image lens system is f, a focal lengthof the first lens element 110 is f1, a focal length of the second lenselement 120 is f2, a focal length of the third lens element 130 is f3,and a focal length of the fourth lens element 140 is f4, the followingrelationships are satisfied:

f/f2=0.13;

f/f3+|f/f4|=1.88;

(f1−f3)(f1+f3)=0.41; and

(f2−f3)/(f2+f3)=0.73.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 3.33 mm, Fno = 2.35, HFOV = 39.4 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # length0 Object Plano Infinity 1 Ape. Stop Plano −0.118 2 Lens 1 1.952 (ASP)0.398 Plastic 1.544 55.9 9.16 3 2.978 (ASP) 0.069 4 Lens 2 2.003 (ASP)0.280 Plastic 1.640 23.3 24.92 5 2.167 (ASP) 0.205 6 Lens 3 4.143 (ASP)0.551 Plastic 1.544 55.9 3.81 7 −3.947 (ASP) 0.211 8 Lens 4 −0.969 (ASP)0.421 Plastic 1.640 23.3 −3.31 9 −2.089 (ASP) 0.030 10 Lens 5 3.867(ASP) 1.105 Plastic 1.535 56.3 1.42 11 −0.847 (ASP) 0.030 12 Lens 6−16.711 (ASP) 0.440 Plastic 1.535 56.3 −1.39 13 0.785 (ASP) 0.700 14IR-cut filter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.235 16 ImagePlano — Note: Reference wavelength (d-line) is 587.6 nm.

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −2.1201E+00−2.0000E+01 −1.2382E+01 −3.0060E+00 1.0000E+00 0.0000E+00 A4 =3.5988E−03 −1.7492E−01 −2.6551E−01 −2.5306E−01 −1.4680E−01 −4.4328E−02A6 = 3.7387E−01 9.8443E−02 5.7642E−01 3.1573E−01 −1.9199E−02 −1.6599E−01A8 = −1.3929E+00 6.6244E−01 −1.1253E+00 −2.1258E−01 1.1489E−014.8223E−02 A10 = 1.4094E+00 −1.7257E+00 1.1555E+00 9.4103E−02−1.6910E−01 9.4653E−03 A12 = 2.0282E+00 6.6955E−01 1.4439E−02−2.7001E−01 −1.1287E−01 1.2137E−02 A14 = −3.6199E+00 −3.4243E−01−1.9141E+00 1.1110E−01 1.2615E−01 −8.1558E−03 Surface # 8 9 10 11 12 13k = −1.4213E+00 −3.0569E+00 −6.3368E+00 −4.2091E+00 −2.0000E+01−5.1631E+00 A4 = 3.3847E−01 1.4102E−01 −1.6984E−01 −6.7672E−02−1.3442E−01 −7.5325E−02 A6 = −8.7891E−01 −2.7755E−01 1.4944E−01−3.0645E−02 3.8933E−02 2.4095E−02 A8 = 1.1445E+00 3.2138E−01 −9.9124E−021.0444E−01 −6.2383E−03 −5.8920E−03 A10 = −9.1578E−01 −2.4968E−011.3353E−02 −8.3869E−02 7.5356E−04 1.0269E−03 A12 = 5.9482E−01 1.2901E−011.6198E−03 2.6536E−02 2.2005E−04 −1.1564E−04 A14 = −2.0143E−01−2.7976E−02 1.2524E−03 −2.7869E−03 −5.2957E−05 5.9417E−06

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-16 represent the surfacessequentially arranged from the object-side to the image-side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A1-A14 represent the asphericcoefficients ranging from the 1st order to the 14th order. Thisinformation related to Table 1 and Table 2 applies also to the Tablesfor the remaining embodiments, and so an explanation in this regard willnot be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an optical image lens system according tothe 2nd embodiment of the present disclosure. FIG. 4 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theoptical image lens system according to the 2nd embodiment. In FIG. 3,the optical image lens system includes, in order from an object side toan image side, a first lens element 210, an aperture stop 200, a secondlens element 220, a third lens element 230, a fourth lens element 240, afifth lens element 250, a sixth lens element 260, an IR-cut filter 280and an image plane 270.

The first lens element 210 with positive refractive power has a convexobject-side surface 211 and a concave image-side surface 212. The firstlens element 210 is made of plastic material and has the object-sidesurface 211 and the image-side surface 212 being aspheric.

The second lens element 220 with positive refractive power has a convexobject-side surface 221 and a concave image-side surface 222. The secondlens element 220 is made of plastic material and has the object-sidesurface 221 and the image-side surface 222 being aspheric.

The third lens element 230 with positive refractive power has a convexobject-side surface 231 and a convex image-side surface 232. The thirdlens element 230 is made of plastic material and has the object-sidesurface 231 and the image-side surface 232 being aspheric.

The fourth lens element 240 with negative refractive power has a concaveobject-side surface 241 and a convex image-side surface 242. The fourthlens element 240 is made of plastic material and has the object-sidesurface 241 and the image-side surface 242 being aspheric.

The fifth lens element 250 with positive refractive power has a convexobject-side surface 251 and a convex image-side surface 252. The fifthlens element 250 is made of plastic material and has the object-sidesurface 251 and the image-side surface 252 being aspheric.

The sixth lens element 260 with negative refractive power has a convexobject-side surface 261 and a concave image-side surface 262. The sixthlens element 260 is made of plastic material and has the object-sidesurface 261 and the image-side surface 262 being aspheric. Furthermore,the sixth lens element 260 has inflection points on the image-sidesurface 262 thereof.

The IR-cut filter 280 is made of glass, and located between the sixthlens element 260 and the image plane 270, and will not affect the focallength of the optical image lens system.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 2.88 mm, Fno = 2.35, HFOV = 42.6 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # length0 Object Plano Infinity 1 Lens 1 2.333 (ASP) 0.347 Plastic 1.544 55.99.77 2 3.939 (ASP) 0.083 3 Ape. Stop Plano 0.014 4 Lens 2 2.689 (ASP)0.240 Plastic 1.640 23.3 97.03 5 2.713 (ASP) 0.178 6 Lens 3 5.719 (ASP)0.618 Plastic 1.544 55.9 3.43 7 −2.667 (ASP) 0.278 8 Lens 4 −0.802 (ASP)0.327 Plastic 1.640 23.3 −2.62 9 −1.780 (ASP) 0.040 10 Lens 5 3.039(ASP) 0.987 Plastic 1.544 55.9 1.24 11 −0.766 (ASP) 0.054 12 Lens 63.038 (ASP) 0.353 Plastic 1.544 55.9 −1.36 13 0.572 (ASP) 0.700 14IR-cut filter Plano 0.200 Glass 1.517 64.2 — 15 Plano 0.328 16 ImagePlano — Note: Reference wavelength (d-line) is 587.6 nm.

TABLE 4 Aspheric Coefficients Surface # 1 2 4 5 6 7 k = −1.1432E+00−2.3615E+01 −3.1613E+00 −3.1040E+00 −1.8911E+01 3.0000E+00 A4 =2.4516E−02 −4.5646E−02 −3.6340E−01 −3.4957E−01 −1.5978E−01 −8.8230E−02A6 = 2.2490E−01 2.7998E−01 5.4276E−01 2.9498E−01 1.9181E−02 −1.6167E−01A8 = −4.5625E−01 −9.2979E−02 −1.0084E+00 −1.8866E−01 1.4820E−027.9986E−03 A10 = 1.5998E−01 −1.2815E+00 2.9526E−01 −5.4625E−01−1.9173E−01 −1.4040E−02 A12 = 9.5445E−01 6.6948E−01 1.4432E−026.9967E−01 −1.0910E−01 −7.2931E−03 A14 = −1.1811E+00 −3.4243E−01−1.9141E+00 1.1117E−01 2.0918E−01 −2.0349E−02 Surface # 8 9 10 11 12 13k = −1.2230E+00 −2.1117E+00 −2.0257E−01 −5.2017E+00 −1.4581E+01−4.2152E+00 A4 = 3.0206E−01 1.1349E−01 −1.6340E−01 −5.0767E−02−1.5511E−01 −8.2194E−02 A6 = −9.2088E−01 −2.8585E−01 1.4228E−01−1.8256E−02 3.9870E−02 2.4293E−02 A8 = 1.1189E+00 3.2260E−01 −9.0979E−021.0162E−01 −5.8713E−03 −6.2126E−03 A10 = −9.2264E−01 −2.4528E−011.4952E−02 −8.5942E−02 5.8716E−04 1.1026E−03 A12 = 6.1715E−01 1.3241E−01−1.2856E−04 2.6297E−02 1.7939E−04 −1.2273E−04 A14 = −1.7102E−01−3.0569E−02 3.4923E−04 −2.4964E−03 −3.7940E−05 6.4882E−06

In the optical image system according to the 2nd embodiment, thedefinitions of f, Fno, HFOV, V1, V2, V4, V5, R7, R8, CT2, CT3, f1, f2,f3 and f4 are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment. Moreover, these parameterscan be calculated from Table 3 and Table 4 as the following values andsatisfy the following relationships:

f (mm) 2.88 (R7 − R8)/(R7 + R8) −0.38 Fno 2.35 f/f2 0.03 HFOV (deg.)42.6 f/f3 + |f/f4| 1.94 V1/V2 2.40 (f1 − f3)/(f1 + f3) 0.48 V5/V4 2.40(f2 − f3)/(f2 + f3) 0.93 CT2/CT3 0.39

3rd Embodiment

FIG. 5 is a schematic view of an optical image lens system according tothe 3rd embodiment of the present disclosure. FIG. 6 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theoptical image lens system according to the 3rd embodiment. In FIG. 5,the optical image lens system includes, in order from an object side toan image side, an aperture stop 300, a first lens element 310, a secondlens element 320, a third lens element 330, a fourth lens element 340, afifth lens element 350, a sixth lens element 360, an IR-cut filter 380and an image plane 370.

The first lens element 310 with positive refractive power has a convexobject-side surface 311 and a concave image-side surface 312. The firstlens element 310 is made of plastic material and has the object-sidesurface 311 and the image-side surface 312 being aspheric.

The second lens element 320 with positive refractive power has a convexobject-side surface 321 and a concave image-side surface 322. The secondlens element 320 is made of plastic material and has the object-sidesurface 321 and the image-side surface 322 being aspheric.

The third lens element 330 with positive refractive power has a convexobject-side surface 331 and a convex image-side surface 332. The thirdlens element 330 is made of plastic material and has the object-sidesurface 331 and the image-side surface 332 being aspheric.

The fourth lens element 340 with negative refractive power has a concaveobject-side surface 341 and a convex image-side surface 342. The fourthlens element 340 is made of plastic material and has the object-sidesurface 341 and the image-side surface 342 being aspheric.

The fifth lens element 350 with positive refractive power has a convexobject-side surface 351 and a convex image-side surface 352. The fifthlens element 350 is made of plastic material and has the object-sidesurface 351 and the image-side surface 352 being aspheric.

The sixth lens element 360 with negative refractive power has a concaveobject-side surface 361 and a concave image-side surface 362. The sixthlens element 360 is made of plastic material and has the object-sidesurface 361 and the image-side surface 362 being aspheric. Furthermore,the sixth lens element 360 has inflection points on the image-sidesurface 362 thereof.

The IR-cut filter 380 is made of glass, and located between the sixthlens element 360 and the image plane 370, and will not affect the focallength of the optical image lens system.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 2.94 mm, Fno = 2.50, HFOV = 40.0 deg. SurfaceFocal # Curvature Radius Thickness Material Index Abbe # length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.066  2 Lens 1 2.019 (ASP) 0.320Plastic 1.535 56.3 22.35 3 2.295 (ASP) 0.086 4 Lens 2 1.639 (ASP) 0.292Plastic 1.535 56.3 9.22 5 2.303 (ASP) 0.172 6 Lens 3 4.268 (ASP) 0.535Plastic 1.535 56.3 3.77 7 −3.649 (ASP) 0.261 8 Lens 4 −0.757 (ASP) 0.318Plastic 1.650 21.4 −2.95 9 −1.458 (ASP) 0.036 10 Lens 5 2.425 (ASP)0.954 Plastic 1.535 56.3 1.23 11 −0.781 (ASP) 0.146 12 Lens 6 −95.114(ASP) 0.232 Plastic 1.535 56.3 −1.20 13 0.648 (ASP) 0.600 14 IR-cutfilter Plano 0.200 Glass 1.517 64.2 — 15 Plano 0.306 16 Image Plano —Note: Reference wavelength (d-line) is 587.6 nm.

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −3.0326+00−2.0000E+01 −7.3636E+00 −4.6612E+00 −1.9780E+01 5.1915E+50 A4 =−1.5699E−02 −1.3917E−01 −2.8035E−01 −2.8429E−01 −1.8369E−01 −7.1229E−02A6 = 2.8981E−01 1.1866E−01 4.6914E−01 2.0186E−01 −8.7536E−02 −1.7794E−01A8 = −1.0018E+00 9.6562E−03 −1.1926E+00 −2.6611E−01 1.0439E−015.4391E−02 A10 = 7.8263E−01 −1.3584E+00 9.1184E−01 1.3883E−01−1.2512E−01 1.0047E−02 A12 = 2.0282E+00 9.3670E−01 −1.1254E−01−2.6507E−01 −9.8560E−02 3.8337E−03 A14 = −3.6199E+00 −3.4243E−01−1.9141E+00 1.5258E−01 1.5770E−01 −5.9692E−05 Surface # 8 9 10 11 12 13k = −1.6939E+00 −2.3770E+00 −5.0705E+00 −5.9220E+00 −1.0000E+00−5.7800E+00 A4 = 3.4912E−01 1.4501E−01 −1.6952E−01 −2.8865E−02−1.4085E−01 −7.5701E−02 A6 = −8.8791E−01 −2.7334E−01 1.6077E−01−2.8480E−02 3.7043E−02 2.1023E−02 A8 = 1.1331E+00 3.2261E−01 −9.3525E−021.0220E−01 −6.5169E−03 −5.8861E−03 A10 = −9.2398E−01 −2.4985E−011.4659E−02 −8.4239E−02 4.1222E−04 1.0882E−03 A12 = 5.8827E−01 1.2856E−019.9787E−04 2.6674E−02 2.0903E−04 −9.7933E−05 A14 = −1.9567E−01−2.9324E−02 1.1209E−04 −2.7428E−03 −3.1115E−06 1.8267E−06

In the optical image system according to the 3rd embodiment, thedefinitions of f, Fno, HFOV, V1, V2, V4, V5, R7, R8, CT2, CT3, f1, f2,f3 and f4 are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment. Moreover, these parameterscan be calculated from Table 5 and Table 6 as the following values andsatisfy the following relationships:

f (mm) 2.94 (R7 − R8)/(R7 + R8) −0.32 Fno 2.50 f/f2 0.32 HFOV (deg.)40.0 f/f3 + |f/f4| 1.77 V1/V2 1.00 (f1 − f3)/(f1 + f3) 0.71 V5/V4 2.63(f2 − f3)/(f2 + f3) 0.42 CT2/CT3 0.55

4th Embodiment

FIG. 7 is a schematic view of an optical image lens system according tothe 4th embodiment of the present disclosure. FIG. 8 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theoptical image lens system according to the 4th embodiment. In FIG. 7,the optical image lens system includes, in order from an object side toan image side, an aperture stop 400, a first lens element 410, a secondlens element 420, a third lens element 430, a fourth lens element 440, afifth lens element 450, a sixth lens element 460, an IR-cut filter 480and an image plane 470.

The first lens element 410 with positive refractive power has a convexobject-side surface 411 and a concave image-side surface 412. The firstlens element 410 is made of plastic material and has the object-sidesurface 411 and the image-side surface 412 being aspheric.

The second lens element 420 with positive refractive power has a convexobject-side surface 421 and a concave image-side surface 422. The secondlens element 420 is made of plastic material and has the object-sidesurface 421 and the image-side surface 422 being aspheric.

The third lens element 430 with positive refractive power has a convexobject-side surface 431 and a convex image-side surface 432. The thirdlens element 430 is made of plastic material and has the object-sidesurface 431 and the image-side surface 432 being aspheric.

The fourth lens element 440 with negative refractive power has a concaveobject-side surface 441 and a convex image-side surface 442. The fourthlens element 440 is made of plastic material and has the object-sidesurface 441 and the image-side surface 442 being aspheric.

The fifth lens element 450 with positive refractive power has a convexobject-side surface 451 and a convex image-side surface 452. The fifthlens element 450 is made of plastic material and has the object-sidesurface 451 and the image-side surface 452 being aspheric.

The sixth lens element 460 with negative refractive power has a concaveobject-side surface 461 and a concave image-side surface 462. The sixthlens element 460 is made of plastic material and has the object-sidesurface 461 and the image-side surface 462 being aspheric. Furthermore,the sixth lens element 460 has inflection points on the image-sidesurface 462 thereof.

The IR-cut filter 480 is made of glass, and located between the sixthlens element 460 and the image plane 470, and will not affect the focallength of the optical image lens system.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 2.82 mm, Fno = 2.45, HFOV = 45.0 deg. SurfaceFocal # Curvature Radius Thickness Material Index Abbe # length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.066  2 Lens 1 1.919 (ASP) 0.309Plastic 1.544 55.9 59.39 3 1.925 (ASP) 0.090 4 Lens 2 1.216 (ASP) 0.240Plastic 1.544 55.9 13.22 5 1.362 (ASP) 0.145 6 Lens 3 2.366 (ASP) 0.565Plastic 1.544 55.9 2.59 7 −3.191 (ASP) 0.276 8 Lens 4 −0.493 (ASP) 0.240Plastic 1.640 23.3 −2.35 9 −0.873 (ASP) 0.050 10 Lens 5 2.573 (ASP)0.692 Plastic 1.544 55.9 1.25 11 −0.837 (ASP) 0.064 12 Lens 6 −12.466(ASP) 0.400 Plastic 1.544 55.9 −1.46 13 0.857 (ASP) 0.350 14 IR-cutfilter Plano 0.300 Glass 1.517 64.2 — 15 Plano 0.568 16 Image Plano —Note: Reference wavelength (d-line) is 587.6 nm.

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −1.1304E+00−1.0000E+01 −5.9733E+00 −6.3151E+00 −2.0594E+00 −9.9189E+00 A4 =−4.6085E−02 −2.7025E−01 −2.3433E−01 −1.5238E−01 −1.5161E−01 1.0883E−02A6 = 1.8770E−01 5.5202E−01 5.4339E−01 2.3689E−01 −3.3209E−02 −1.7866E−01A8 = −4.9042E−01 −1.0988E+00 −1.5028E+00 −4.8038E−01 2.6532E−021.4862E−03 A10 −8.1943E−01 −8.0919E−01 3.9319E−01 2.0965E−01 −2.1772E−01−1.0334E−02 A12 = 4.3223E+00 6.6949E−01 2.6664E+00 −4.7043E−016.4874E−02 1.0250E−02 A14 = −6.2030E+00 −3.4243E−01 −7.5558E+001.2032E−01 1.9868E−02 1.7371E−02 Surface # 8 9 10 11 12 13 k =−2.0028E+00 −3.5513E+00 −2.4274E+01 −5.0525E+00 −4.1613E+01 −7.8941E+00A4 = 4.3067E−01 1.6688E−01 −1.6373E−01 −4.2794E−02 −6.4527E−02−7.8014E−02 A6 = −8.3071E−01 −2.4687E−01 1.7289E−01 1.1889E−023.5162E−02 2.7325E−02 A8 = 1.1445E+00 3.4134E−01 −9.1197E−02 1.0587E−01−6.7370E−03 −6.8681E−03 A10 = −9.4459E−01 −2.4418E−01 1.6490E−02−8.6392E−02 1.9348E−04 1.0402E−03 A12 = 5.7702E−01 1.1654E−01 1.8546E−042.5506E−02 1.0040E−04 −1.2537E−04 A14 = −2.0758E−01 −2.8446E−02−5.3761E−04 −2.7260E−03 −9.3161E−06 9.5624E−06

In the optical image system according to the 4th embodiment, thedefinitions of f, Fno, HFOV, V1, V2, V4, V5, R7, R8, CT2, CT3, f1, f2,f3 and f4 are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment. Moreover, these parameterscan be calculated from Table 7 and Table 8 as the following values andsatisfy the following relationships:

f (mm) 2.82 (R7 − R8)/(R7 + R8) −0.28 Fno 2.45 f/f2 0.21 HFOV (deg.)45.0 f/f3 + |f/f4| 2.29 V1/V2 1.00 (f1 − f3)/(f1 + f3) 0.92 V5/V4 2.40(f2 − f3)/(f2 + f3) 0.67 CT2/CT3 0.42

5th Embodiment

FIG. 9 is a schematic view of an optical image lens system according tothe 5th embodiment of the present disclosure. FIG. 10 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theoptical image lens system according to the 5th embodiment. In FIG. 9,the optical image lens system includes, in order from an object side toan image side, an aperture stop 500, a first lens element 510, a secondlens element 520, a third lens element 530, a fourth lens element 540, afifth lens element 550, a sixth lens element 560, an IR-cut filter 580and an image plane 570.

The first lens element 510 with positive refractive power has a convexobject-side surface 511 and a concave image-side surface 512. The firstlens element 510 is made of plastic material and has the object-sidesurface 511 and the image-side surface 512 being aspheric.

The second lens element 520 with positive refractive power has a convexobject-side surface 521 and a concave image-side surface 522. The secondlens element 520 is made of plastic material and has the object-sidesurface 521 and the image-side surface 522 being aspheric.

The third lens element 530 with positive refractive power has a concaveobject-side surface 531 and a convex image-side surface 532. The thirdlens element 530 is made of plastic material and has the object-sidesurface 531 and the image-side surface 532 being aspheric.

The fourth lens element 540 with negative refractive power has a concaveobject-side surface 541 and a convex image-side surface 542. The fourthlens element 540 is made of plastic material and has the object-sidesurface 541 and the image-side surface 542 being aspheric.

The fifth lens element 550 with positive refractive power has a convexobject-side surface 551 and a convex image-side surface 552. The fifthlens element 550 is made of plastic material and has the object-sidesurface 551 and the image-side surface 552 being aspheric.

The sixth lens element 560 with negative refractive power has a convexobject-side surface 561 and a concave image-side surface 562. The sixthlens element 560 is made of plastic material and has the object-sidesurface 561 and the image-side surface 562 being aspheric. Furthermore,the sixth lens element 560 has inflection points on the image-sidesurface 562 thereof.

The IR-cut filter 580 is made of glass, and located between the sixthlens element 560 and the image plane 570, and will not affect the focallength of the optical image lens system.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 3.24 mm, Fno = 2.25, HFOV = 40.2 deg. SurfaceFocal # Curvature Radius Thickness Material Index Abbe # length 0 ObjectPlano Infinity 1 Ape. Stop Plano −0.112  2 Lens 1 2.233 (ASP) 0.387Plastic 1.535 56.3 5.81 3 7.446 (ASP) 0.060 4 Lens 2 2.651 (ASP) 0.256Plastic 1.633 23.4 42.00 5 2.835 (ASP) 0.224 6 Lens 3 −28.571 (ASP)0.686 Plastic 1.535 56.3 4.22 7 −2.108 (ASP) 0.180 8 Lens 4 −0.823 (ASP)0.345 Plastic 1.633 23.4 −3.33 9 −1.570 (ASP) 0.053 10 Lens 5 6.091(ASP) 0.921 Plastic 1.535 56.3 1.48 11 −0.859 (ASP) 0.067 12 Lens 66.823 (ASP) 0.387 Plastic 1.535 56.3 −1.52 13 0.710 (ASP) 0.700 14IR-cut filter Plano 0.200 Glass 1.517 64.2 — 15 Plano 0.444 16 ImagePlano — Note: Reference wavelength (d-line) is 587.6 nm.

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −2.2134E+00−1.6024E+01 −2.0000E+01 −2.8509E+00 −1.0000E+00 4.6261E−01 A4 =4.2222E−03 −1.9156E−01 −2.9127E−01 −2.7784E−01 −1.3537E−01 −4.5900E−02A6 = 4.3401E−01 1.9053E−01 5.7747E−01 2.2287E−01 −3.8550E−02 −1.6872E−01A8 = −1.5917E+00 6.5246E−01 −1.0863E+00 −1.9672E−01 1.2037E−015.7257E−02 A10 = 1.7060E+00 −1.5698E+00 1.1754E+00 1.0448E−01−1.5649E−01 1.5621E−02 A12 = 2.0282E+00 6.6955E−01 1.4439E−02−2.7001E−01 −1.1287E−01 −2.1144E−03 A14 = −3.6199E+00 −3.4243E−01−1.9141E+00 1.1110E−01 1.2615E−01 −7.7322E−03 Surface # 8 9 10 11 12 13k = −1.3111E+00 −1.9309E+00 −1.9773E+01 −4.7709E+00 −1.0000E+00−4.6524E+00 A4 = 3.2307E−01 1.3518E−01 −1.7326E−01 −5.8048E−02−1.3872E−01 −7.5707E−02 A6 = −8.9506E−01 −2.7409E−01 1.4917E−01−3.4956E−02 3.9401E−02 2.4043E−02 A8 = 1.1320E+00 3.2450E−01 −9.7622E−021.0410E−01 −7.2971E−03 −6.1049E−03 A10 = −9.2436E−01 −2.4822E−011.4582E−02 −8.3531E−02 6.5865E−04 1.0253E−03 A12 = 5.9454E−01 1.2890E−012.3164E−03 2.6542E−02 1.7220E−04 −1.0923E−04 A14 = −1.9054E−01−2.8163E−02 7.8494E−04 −2.7389E−03 −3.1458E−05 5.5298E−06

In the optical image system according to the 5th embodiment, thedefinitions of f, Fno, HFOV, V1, V2, V4, V5, R7, R8, CT2, CT3, f1, f2,f3 and f4 are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment. Moreover, these parameterscan be calculated from Table 9 and Table 10 as the following values andsatisfy the following relationships:

f (mm) 3.24 (R7 − R8)/(R7 + R8) −0.31 Fno 2.25 f/f2 0.08 HFOV (deg.)40.2 f/f3 + |f/f4| 1.74 V1/V2 2.41 (f1 − f3)/(f1 + f3) 0.16 V5/V4 2.41(f2 − f3)/(f2 + f3) 0.82 CT2/CT3 0.37

6th Embodiment

FIG. 11 is a schematic view of an optical image lens system according tothe 6th embodiment of the present disclosure. FIG. 12 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theoptical image lens system according to the 6th embodiment. In FIG. 11,the optical image lens system includes, in order from an object side toan image side, a first lens element 610, an aperture stop 600, a secondlens element 620, a third lens element 630, a fourth lens element 640, afifth lens element 650, a sixth lens element 660, an IR-cut filter 680and an image plane 670.

The first lens element 610 with positive refractive power has a convexobject-side surface 611 and a concave image-side surface 612. The firstlens element 610 is made of plastic material and has the object-sidesurface 611 and the image-side surface 612 being aspheric.

The second lens element 620 with positive refractive power has a convexobject-side surface 621 and a concave image-side surface 622. The secondlens element 620 is made of plastic material and has the object-sidesurface 621 and the image-side surface 622 being aspheric.

The third lens element 630 with positive refractive power has a convexobject-side surface 631 and a convex image-side surface 632. The thirdlens element 630 is made of plastic material and has the object-sidesurface 631 and the image-side surface 632 being aspheric.

The fourth lens element 640 with negative refractive power has a concaveobject-side surface 641 and a convex image-side surface 642. The fourthlens element 640 is made of plastic material and has the object-sidesurface 641 and the image-side surface 642 being aspheric.

The fifth lens element 650 with positive refractive power has a convexobject-side surface 651 and a convex image-side surface 652. The fifthlens element 650 is made of plastic material and has the object-sidesurface 651 and the image-side surface 652 being aspheric.

The sixth lens element 660 with negative refractive power has a convexobject-side surface 661 and a concave image-side surface 662. The sixthlens element 660 is made of plastic material and has the object-sidesurface 661 and the image-side surface 662 being aspheric. Furthermore,the sixth lens element 660 has inflection points on the image-sidesurface 662 thereof.

The IR-cut filter 680 is made of glass, and located between the sixthlens element 660 and the image plane 670, and will not affect the focallength of the optical image lens system.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 2.88 mm, Fno = 2.00, HFOV = 42.5 deg.Surface Focal # Curvature Radius Thickness Material Index Abbe # length0 Object Plano Infinity 1 Lens 1 2.427 (ASP) 0.334 Plastic 1.544 55.927.01 2 2.766 (ASP) 0.093 3 Ape. Stop Plano −0.008  4 Lens 2 1.803 (ASP)0.314 Plastic 1.544 55.9 9.03 5 2.674 (ASP) 0.189 6 Lens 3 6.182 (ASP)0.557 Plastic 1.544 55.9 3.59 7 −2.763 (ASP) 0.283 8 Lens 4 −0.717 (ASP)0.326 Plastic 1.640 23.3 −2.68 9 −1.451 (ASP) 0.041 10 Lens 5 3.008(ASP) 0.923 Plastic 1.544 55.9 1.37 11 −0.883 (ASP) 0.040 12 Lens 62.506 (ASP) 0.352 Plastic 1.544 55.9 −1.62 13 0.621 (ASP) 0.700 14IR-cut filter Plano 0.200 Glass 1.517 64.2 — 15 Plano 0.341 16 ImagePlano — Note: Reference wavelength (d-line) is 587.6 nm.

TABLE 12 Aspheric Coefficients Surface # 1 2 4 5 6 7 k = −3.8085E+00−3.0000E+01 −9.0861E+00 −1.7410E+00 −2.7059E+01 2.9900E+00 A4 =−3.9228E−03 −1.3602E−01 −3.3470E−01 −3.5088E−01 −1.9191E−01 −9.1534E−02A6 = 2.3564E−01 4.8375E−01 8.3572E−01 8.5410E−02 −6.4661E−02 −1.5909E−01A8 = −4.2724E−01 −4.9739E−01 −2.0042E+00 2.1743E−02 −7.0699E−038.3937E−03 A10 = 1.1015E−01 −5.1658E−01 1.8188E+00 −7.3329E−01−9.9376E−02 4.5093E−02 A12 = 6.0247E−01 6.6948E−01 1.4431E−02 5.8596E−01−9.8247E−02 9.6460E−03 A14 = −6.201E−01 −3.4243E−01 −1.9141E+001.1117E−01 2.0918E−01 −2.4173E−02 Surface # 8 9 10 11 12 13 k =−1.3919E+00 −2.0077E+00 2.1467E−02 −6.2136E+00 −1.3254E+01 −4.3006E+00A4 = 3.0790E−01 1.2895E−01 −1.5511E−01 −3.8790E−02 −1.6340E−01−8.9174E−02 A6 = −9.2923E−01 −2.7331E−01 1.3175E−01 −2.3197E−024.1537E−02 2.5877E−02 A8 = 1.1603E+00 3.1410E−01 −8.2269E−02 9.9599E−02−5.5056E−03 −6.3285E−03 A10 = −8.8469E−01 −2.5029E−01 1.2617E−02−8.5141E−02 4.9665E−04 1.1102E−03 A12 = 5.8112E−01 1.3273E−01−2.0471E−03 2.6521E−02 1.6478E−04 −1.2730E−04 A14 = −1.8582E−01−2.7679E−02 1.3122E−03 −2.6188E−03 −3.4486E−05 7.0526E−06

In the optical image system according to the 6th embodiment, thedefinitions of f, Fno, HFOV, V1, V2, V4, V5, R7, R8, CT2, CT3, f1, f2,f3 and f4 are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment. Moreover, these parameterscan be calculated from Table 11 and Table 12 as the following values andsatisfy the following relationships:

f (mm) 2.88 (R7 − R8)/(R7 + R8) −0.34 Fno 2.00 f/f2 0.32 HFOV (deg.)42.5 f/f3 + |f/f4| 1.88 V1/V2 1.00 (f1 − f3)/(f1 + f3) 0.77 V5/V4 2.40(f2 − f3)/(f2 + f3) 0.43 CT2/CT3 0.56

7th Embodiment

FIG. 13 is a schematic view of an optical image lens system according tothe 7th embodiment of the present disclosure. FIG. 14 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theoptical image lens system according to the 7th embodiment. In FIG. 13,the optical image lens system includes, in order from an object side toan image side, an aperture stop 700, a first lens element 710, a secondlens element 720, a third lens element 730, a fourth lens element 740, afifth lens element 750, a sixth lens element 760, an IR-cut filter 780and an image plane 770.

The first lens element 710 with positive refractive power has a convexobject-side surface 711 and a convex image-side surface 712. The firstlens element 710 is made of plastic material and has the object-sidesurface 711 and the image-side surface 712 being aspheric.

The second lens element 720 with positive refractive power has a convexobject-side surface 721 and a concave image-side surface 722. The secondlens element 720 is made of plastic material and has the object-sidesurface 721 and the image-side surface 722 being aspheric.

The third lens element 730 with positive refractive power has a concaveobject-side surface 731 and a convex image-side surface 732. The thirdlens element 730 is made of plastic material and has the object-sidesurface 731 and the image-side surface 732 being aspheric.

The fourth lens element 740 with negative refractive power has a concaveobject-side surface 741 and a convex image-side surface 742. The fourthlens element 740 is made of plastic material and has the object-sidesurface 741 and the image-side surface 742 being aspheric.

The fifth lens element 750 with positive refractive power has a convexobject-side surface 751 and a convex image-side surface 752. The fifthlens element 750 is made of plastic material and has the object-sidesurface 751 and the image-side surface 752 being aspheric.

The sixth lens element 760 with negative refractive power has a convexobject-side surface 761 and a concave image-side surface 762. The sixthlens element 760 is made of plastic material and has the object-sidesurface 761 and the image-side surface 762 being aspheric. Furthermore,the sixth lens element 760 has inflection points on the image-sidesurface 762 thereof.

The IR-cut filter 780 is made of glass, and located between the sixthlens element 760 and the image plane 770, and will not affect the focallength of the optical image lens system.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 3.01 mm, Fno = 2.25, HFOV = 41.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # length 0Object Plano Infinity 1 Ape. Stop Plano −0.055  2 Lens 1 3.289 (ASP)0.366 Plastic 1.544 55.9 5.29 3 −22.202 (ASP) 0.060 4 Lens 2 5.626 (ASP)0.307 Plastic 1.650 21.4 30.37 5 7.702 (ASP) 0.224 6 Lens 3 −9.496 (ASP)0.646 Plastic 1.544 55.9 4.13 7 −1.860 (ASP) 0.183 8 Lens 4 −0.859 (ASP)0.318 Plastic 1.650 21.4 −3.25 9 −1.660 (ASP) 0.050 10 Lens 5 8.398(ASP) 0.932 Plastic 1.535 56.3 1.42 11 −0.802 (ASP) 0.050 12 Lens 64.282 (ASP) 0.394 Plastic 1.544 55.9 −1.43 13 0.637 (ASP) 0.700 14IR-cut filter Plano 0.200 Glass 1.517 64.2 — 15 Plano 0.367 16 ImagePlano — Note: Reference wavelength (d-line) is 587.6 nm.

TABLE 14 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −4.8914E+00−1.8951E+01 −1.8109E+01 −3.0257E+01 −1.0000E+00 4.1904E−01 A4 =−2.1717E−02 −1.4581E−01 −3.4042E−01 −2.8730E−01 −1.4487E−01 −4.0908E−02A6 = 3.7776E−01 2.2475E−01 6.0346E−01 1.4689E−01 −4.1175E−02 −1.7739E−01A8 = −1.2572E+00 5.1629E−01 −1.1028E+00 −1.5281E−01 1.6282E−015.5016E−02 A10 = 1.2828E+00 −1.5021E+00 1.0447E+00 1.7001E−01−1.4313E−01 1.0562E−02 A12 = 2.0285E+00 6.6943E−01 1.4500E−02−2.7007E−01 −1.1288E−01 6.3826E−03 A14 = −3.6199E+00 −3.4243E−01−1.9141E+00 1.1109E−01 1.2614E−01 −2.8492E−03 Surface # 8 9 10 11 12 13k = −1.1923E+00 −1.8478E+00 −7.1831E−01 −4.6056E+00 −1.0000E+00−4.1802E+00 A4 = 3.1140E−01 1.3811E−01 −1.6735E−01 −6.2510E−02−1.5380E−01 −7.1268E−02 A6 = −8.9666E−01 −2.6923E−01 1.5170E−01−3.3239E−02 4.1056E−02 2.2822E−02 A8 = 1.1380E+00 3.2722E−01 −9.8712E−021.0486E−01 −6.7412E−03 −5.9391E−03 A10 = −9.2370E−01 −2.4821E−011.4072E−02 −8.3534E−02 5.7624E−04 1.0578E−03 A12 = 5.9689E−01 1.2839E−012.5468E−03 2.6443E−02 1.0584E−04 −1.3056E−04 A14 = −1.8309E−01−2.8692E−02 8.3197E−04 −2.7349E−03 −3.1632E−05 8.0021E−06

In the optical image system according to the 7th embodiment, thedefinitions of f, Fno, HFOV, V1, V2, V4, V5, R7, R8, CT2, CT3, f1, f2,f3 and f4 are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment. Moreover, these parameterscan be calculated from Table 13 and Table 14 as the following values andsatisfy the following relationships:

f (mm) 3.01 (R7 − R8)/(R7 + R8) −0.32 Fno 2.25 f/f2 0.10 HFOV (deg.)41.0 f/f3 + |f/f4| 1.66 V1/V2 2.61 (f1 − f3)/(f1 + f3) 0.12 V5/V4 2.63(f2 − f3)/(f2 + f3) 0.76 CT2/CT3 0.48

8th Embodiment

FIG. 15 is a schematic view of an optical image lens system according tothe 8th embodiment of the present disclosure. FIG. 16 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theoptical image lens system according to the 8th embodiment. In FIG. 15,the optical image lens system includes, in order from an object side toan image side, an aperture stop 800, a first lens element 810, a secondlens element 820, a third lens element 830, a fourth lens element 840, afifth lens element 850, a sixth lens element 860, an IR-cut filter 880and an image plane 870.

The first lens element 810 with positive refractive power has a convexobject-side surface 811 and a concave image-side surface 812. The firstlens element 810 is made of plastic material and has the object-sidesurface 811 and the image-side surface 812 being aspheric.

The second lens element 820 with positive refractive power has a convexobject-side surface 821 and a concave image-side surface 822. The secondlens element 820 is made of plastic material and has the object-sidesurface 821 and the image-side surface 822 being aspheric.

The third lens element 830 with positive refractive power has a convexobject-side surface 831 and a convex image-side surface 832. The thirdlens element 830 is made of plastic material and has the object-sidesurface 831 and the image-side surface 832 being aspheric.

The fourth lens element 840 with negative refractive power has a concaveobject-side surface 841 and a convex image-side surface 842. The fourthlens element 840 is made of plastic material and has the object-sidesurface 841 and the image-side surface 842 being aspheric.

The fifth lens element 850 with positive refractive power has a convexobject-side surface 851 and a convex image-side surface 852. The fifthlens element 850 is made of plastic material and has the object-sidesurface 851 and the image-side surface 852 being aspheric.

The sixth lens element 860 with negative refractive power has a planarobject-side surface 861 and a concave image-side surface 862. The sixthlens element 860 is made of plastic material and has the object-sidesurface 861 and the image-side surface 862 being aspheric. Furthermore,the sixth lens element 860 has inflection points on the image-sidesurface 862 thereof.

The IR-cut filter 880 is made of glass, and located between the sixthlens element 860 and the image plane 870, and will not affect the focallength of the optical image lens system.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 2.98 mm, Fno = 2.50, HFOV = 39.6 deg.Surface Focal # Curvature Radius Thickness Material Index Abbe # length0 Object Plano Infinity 1 Ape. Stop Plano −0.069  2 Lens 1 1.995 (ASP)0.314 Plastic 1.535 56.3 34.97 3 2.111 (ASP) 0.086 4 Lens 2 1.545 (ASP)0.291 Plastic 1.535 56.3 7.41 5 2.367 (ASP) 0.187 6 Lens 3 4.412 (ASP)0.530 Plastic 1.535 56.3 3.78 7 −3.565 (ASP) 0.254 8 Lens 4 −0.749 (ASP)0.339 Plastic 1.650 21.4 −2.98 9 −1.440 (ASP) 0.035 10 Lens 5 2.419(ASP) 0.944 Plastic 1.535 56.3 1.31 11 −0.851 (ASP) 0.117 12 Lens 6 ∞(ASP) 0.288 Plastic 1.535 56.3 −1.29 13 0.692 (ASP) 0.600 14 IR-cutfilter Plano 0.200 Glass 1.517 64.2 — 15 Plano 0.317 16 Image Plano —Note: Reference wavelength (d-line) is 587.6 nm.

TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −3.3872E+00−2.0000E+01 −7.0403E+00 −2.8509E+00 −2.0000E+01 5.4921E+00 A4 =−1.9080E−02 −1.4020E−01 −2.7603E−01 −2.8510E−01 −1.7987E−01 −5.6842E−02A6 = 2.8040E−01 1.2134E−01 4.7847E−01 1.9989E−01 −8.8145E−02 −1.8252E−01A8 = −9.4735E−01 −7.1546E−02 −1.2150E+00 −2.4674E−01 1.0272E−015.3588E−02 A10 = 6.6878E−01 −1.3245E+00 8.9715E−01 1.4256E−01−1.0705E−01 1.2928E−02 A12 = 2.0138E+00 9.3684E−01 −1.1319E−01−2.6736E−01 −9.8516E−02 3.9173E−03 A14 = −3.6224E+00 −3.4626E−01−1.9154E+00 1.5059E−01 1.5870E−01 2.2232E−03 Surface # 8 9 10 11 12 13 k= −1.8084E+00 −2.4885E+00 −5.0536E+00 −6.2338E+00 −1.0000E+00−5.6909E+00 A4 = 3.5026E−01 1.4882E−01 −1.6930E−01 −2.2263E−02−1.3658E−01 −7.3282E−02 A6 = −8.8762E−01 −2.7313E−01 1.6262E−01−2.9637E−02 3.7702E−02 2.1195E−02 A8 = 1.1341E+00 3.2233E−01 −9.3225E−021.0177E−01 −6.7813E−03 −5.9747E−03 A10 = −9.2008E−01 −2.4940E−011.4915E−02 −8.4146E−02 −1.1484E−03 1.0568E−03 A12 = 5.8851E−011.2865E−01 9.5168E−04 2.6664E−02 6.1364E−04 −9.2687E−05 A14 =−1.9669E−01 −2.9165E−02 2.0140E−04 −2.7546E−03 8.7446E−06 1.9503E−06

In the optical image system according to the 8th embodiment, thedefinitions of f, Fno, HFOV, V1, V2, V4, V5, R7, R8, CT2, CT3, f1, f2,f3 and f4 are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment. Moreover, these parameterscan be calculated from Table 15 and Table 16 as the following values andsatisfy the following relationships:

f (mm) 2.98 (R7 − R8)/(R7 + R8) −0.32 Fno 2.50 f/f2 0.40 HFOV (deg.)39.6 f/f3 + |f/f4| 1.79 V1/V2 1.00 (f1 − f3)/(f1 + f3) 0.80 V5/V4 2.63(f2 − f3)/(f2 + f3) 0.32 CT2/CT3 0.55

9th Embodiment

FIG. 17 is a schematic view of an optical image lens system according tothe 9th embodiment of the present disclosure. FIG. 18 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theoptical image lens system according to the 9th embodiment. In FIG. 17,the optical image lens system includes, in order from an object side toan image side, an aperture stop 900, a first lens element 910, a secondlens element 920, a third lens element 930, a fourth lens element 940, afifth lens element 950, a sixth lens element 960, an IR-cut filter 980and an image plane 970.

The first lens element 910 with positive refractive power has a convexobject-side surface 911 and a concave image-side surface 912. The firstlens element 910 is made of glass material and has the object-sidesurface 911 and the image-side surface 912 being aspheric.

The second lens element 920 with positive refractive power has a convexobject-side surface 921 and a concave image-side surface 922. The secondlens element 920 is made of plastic material and has the object-sidesurface 921 and the image-side surface 922 being aspheric.

The third lens element 930 with positive refractive power has a concaveobject-side surface 931 and a convex image-side surface 932. The thirdlens element 930 is made of plastic material and has the object-sidesurface 931 and the image-side surface 932 being aspheric.

The fourth lens element 940 with negative refractive power has a concaveobject-side surface 941 and a convex image-side surface 942. The fourthlens element 940 is made of plastic material and has the object-sidesurface 941 and the image-side surface 942 being aspheric.

The fifth lens element 950 with positive refractive power has a concaveobject-side surface 951 and a convex image-side surface 952. The fifthlens element 950 is made of plastic material and has the object-sidesurface 951 and the image-side surface 952 being aspheric.

The sixth lens element 960 with negative refractive power has a convexobject-side surface 961 and a concave image-side surface 962. The sixthlens element 960 is made of plastic material and has the object-sidesurface 961 and the image-side surface 962 being aspheric. Furthermore,the sixth lens element 960 has inflection points on the image-sidesurface 962 thereof.

The IR-cut filter 980 is made of glass, and located between the sixthlens element 960 and the image plane 970, and will not affect the focallength of the optical image lens system.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 3.24 mm, Fno = 2.45, HFOV = 40.2 deg.Surface Focal # Curvature Radius Thickness Material Index Abbe # length0 Object Plano Infinity 1 Ape. Stop Plano −0.086  2 Lens 1 2.330 (ASP)0.334 Glass 1.566 61.1 5.73 3 7.850 (ASP) 0.076 4 Lens 2 3.044 (ASP)0.282 Plastic 1.633 23.4 41.93 5 3.315 (ASP) 0.257 6 Lens 3 −28.541(ASP) 0.629 Plastic 1.535 56.3 3.83 7 −1.927 (ASP) 0.185 8 Lens 4 −0.900(ASP) 0.336 Plastic 1.633 23.4 −3.20 9 −1.853 (ASP) 0.050 10 Lens 5−59.373 (ASP) 0.916 Plastic 1.535 56.3 1.61 11 −0.851 (ASP) 0.056 12Lens 6 3.813 (ASP) 0.464 Plastic 1.535 56.3 −1.69 13 0.699 (ASP) 0.70014 IR-cut filter Plano 0.200 Glass 1.517 64.2 — 15 Plano 0.411 16 ImagePlano — Note: Reference wavelength (d-line) is 587.6 nm.

TABLE 18 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = −2.6579E−002.3322E−01 −1.9999E+01 −3.1164E+00 −1.0000E+00 2.8014E−01 A4 =3.7611E−04 −1.8425E−01 −3.1653E−01 −2.8028E−01 −1.1874E−01 −2.5061E−02A6 = 3.5085E−01 3.0351E−01 5.7514E−01 1.4049E−01 −8.7300E−02 −1.9139E−01A8 = −1.1174E+00 2.8999E−01 −1.0964E+00 −1.6707E−01 1.2137E−014.9338E−02 A10 = 1.1395E+00 −1.1537E+00 1.1250E+00 1.1201E−01−1.3086E−01 1.2014E−02 A12 = 2.0282E+00 6.6955E−01 1.4439E−02−2.7001E−01 −1.1287E−01 −8.9646E−03 A14 = −3.6199E+00 −3.4243E−01−1.9141E+00 1.1110E−01 1.2615E−01 3.4752E−04 Surface # 8 9 10 11 12 13 k= −1.1162E+00 −1.1870E+00 −1.7665E+01 −4.0404E+00 −1.0000E+00−4.2474E+00 A4 = 2.9924E−01 1.2198E−01 −1.7204E−01 −7.3104E−02−1.4166E−01 −6.9781E−02 A6 = −9.0597E−01 −2.7603E−01 1.4571E−01−3.6228E−02 3.9430E−02 2.2733E−02 A8 = 1.1222E+00 3.2651E−01 −1.0227E−011.0548E−01 −7.6939E−03 −6.0519E−03 A10 = −9.2228E−01 −2.4657E−011.4052E−02 −8.2912E−02 5.9497E−04 1.0304E−03 A12 = 6.0070E−01 1.2932E−013.7322E−03 2.6541E−02 1.7207E−04 −1.0923E−04 A14 = −1.8996E−01−2.8230E−02 2.0052E−03 −2.8219E−03 −2.7531E−05 5.5361E−06

In the optical image system according to the 9th embodiment, thedefinitions of f, Fno, HFOV, V1, V2, V4, V5, R7, R8, CT2, CT3, f1, f2,f3 and f4 are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment. Moreover, these parameterscan be calculated from Table 17 and Table 18 as the following values andsatisfy the following relationships:

f (mm) 3.24 (R7 − R8)/(R7 + R8) −0.35 Fno 2.45 f/f2 0.08 HFOV (deg.)40.2 f/f3 + |f/f4| 1.86 V1/V2 2.61 (f1 − f3)/(f1 + f3) 0.20 V5/V4 2.41(f2 − f3)/(f2 + f3) 0.83 CT2/CT3 0.45

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims.

What is claimed is:
 1. An optical image lens system comprising, in order from an object side to an image side: a first lens element; a second lens element having positive refractive power; a third lens element with positive refractive power having a convex image-side surface; a fourth lens element having negative refractive power; a fifth lens element with positive refractive power having a convex image-side surface, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric; and a sixth lens element with negative refractive power having a concave image-side surface, wherein at least one of an object-side surface and the image-side surface of the sixth lens element is aspheric, and the image-side surface of the sixth lens element has at least one inflection point thereon; wherein the optical image lens system has a total of six lens elements, and there is a gap between every two lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other.
 2. The optical image lens system of claim 1, wherein the second lens element has a convex object-side surface.
 3. The optical image lens system of claim 1, wherein the second lens element has a concave image-side surface.
 4. The optical image lens system of claim 1, wherein the fourth lens element has a concave object-side surface.
 5. The optical image lens system of claim 1, wherein the third lens element has a convex object-side surface.
 6. The optical image lens system of claim 1, wherein the object-side surface of the fifth lens element is convex, and at least one of the object-side surface and the image-side surface of the fifth lens element has at least one inflection point thereon.
 7. The optical image lens system of claim 1, wherein the object-side surface of the sixth lens element is convex.
 8. The optical image lens system of claim 1, wherein the first lens element has positive refractive power.
 9. The optical image lens system of claim 1, wherein the first lens element has a concave image-side surface.
 10. The optical image lens system of claim 1, wherein both of the object-side surface and the image-side surface of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are aspheric, and the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are made of plastic material.
 11. The optical image lens system of claim 1, wherein a focal length of the optical image lens system is f, a focal length of the second lens element is f2, and the following relationship is satisfied: 0<f/f2<0.8.
 12. The optical image lens system of claim 11, wherein the focal length of the optical image lens system is f, the focal length of the second lens element is f2, and the following relationship is satisfied: 0<f/f2<0.55.
 13. The optical image lens system of claim 1, wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following relationship is satisfied: 0.7<V1/V2<1.3.
 14. The optical image lens system of claim 1, wherein an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, and the following relationship is satisfied: 1.5<V5/V4<3.5.
 15. The optical image lens system of claim 1, wherein a focal length of the second lens element is f2, a focal length of the third lens element is f3, and the following relationship is satisfied: 0.12<(f2−f3)/(f2+f3)<1.0.
 16. The optical image lens system of claim 1, wherein a focal length of the optical image lens system is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following relationship is satisfied: 1.4<f/f3+|f/f4|<2.6.
 17. The optical image lens system of claim 1, wherein a magnitude of a focal length of the fifth lens element is the smallest among the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, and the sixth lens element.
 18. The optical image lens system of claim 1, wherein a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, and the following relationship is satisfied: 0<CT2/CT3<0.75.
 19. The optical image lens system of claim 1, wherein a magnitude of a curvature of the image-side surface of the fifth lens element is the largest among convex surfaces of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element, and a magnitude of a curvature of the image-side surface of the sixth lens element is the largest among concave surfaces of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element.
 20. An optical image lens system comprising, in order from an object side to an image side: a first lens element; a second lens element; a third lens element with positive refractive power having a convex image-side surface; a fourth lens element with negative refractive power having a concave object-side surface; a fifth lens element with positive refractive power having a convex image-side surface, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric; and a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the sixth lens element is aspheric, and the image-side surface of the sixth lens element has at least one inflection point thereon; wherein the optical image lens system has a total of six lens elements, and there is a gap between every two lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other.
 21. The optical image lens system of claim 20, wherein the second lens element has a convex object-side surface and a concave image-side surface.
 22. The optical image lens system of claim 20, wherein the third lens element has a convex object-side surface.
 23. The optical image lens system of claim 20, wherein the first lens element has a concave image-side surface.
 24. The optical image lens system of claim 20, wherein a focal length of the optical image lens system is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and the following relationship is satisfied: 1.4<f/f3+|f/f4|<2.6.
 25. The optical image lens system of claim 20, wherein a magnitude of a focal length of the third lens element is smaller than a magnitude of a focal length of the first lens element or a magnitude of a focal length of the second lens element.
 26. The optical image lens system of claim 20, wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following relationship is satisfied: 0.7<V1/V2<1.3.
 27. The optical image lens system of claim 20, wherein an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, and the following relationship is satisfied: 1.5<V5/V4<3.5.
 28. The optical image lens system of claim 20, wherein an axial distance between the first lens element and the second lens element is smaller than an axial distance between the second lens element and the third lens element. 